<h3>一、加</h3><div><br></div><div>英語的“加”叫add，來自拉丁語addo，ad即“to”; do “put”合起來即put to，也就是“加上”。請看以下add的用例：</div><div><br></div><div>Add 360 to the total. 在總數(shù)上再加360。</div><div><br></div><div>The costs added up to 1000 dollars. 費用總計為1000美元。</div><div><br></div><div>First, we add water;next we boil. 我們先加水，接著把水煮開。</div><div><br></div><div>注：類似“3+4=7”這樣的算式，可用以下包含add的英語句子表達：</div><div><br></div><div>Three added to four makes seven.</div><div><br></div><div>Three and four add up to seven.</div><div><br></div><div>If you add three to four, you get seven.</div><div><br></div><div>二、減</div><div><br></div><div>減，英語subtract，來自拉丁語的subtractus;sub即“away”; tractus “taken”?！皽p”就是“take away(去掉)”。請看以下用例：</div><div><br></div><div>If you subtract 3 from 5, you get 2. 五減去三就得二。</div><div><br></div><div>My son has begun to learn to add and subtract. 我的兒子已在學做加減法了。</div> <h3>三、乘</h3><div><br></div><div>“乘”叫multiply，來自拉丁語的multiplico;multus是“many”的意思;plico， “fold(倍)”，multiply即“manifold(多數(shù)倍的)”。請看例句：</div><div><br></div><div>Five multiplied by three is fifteen. 5乘以3等于15。</div><div><br></div><div>表示兩數(shù)相乘時，除可用multiply, 也可用times。如：</div><div><br></div><div>Five times eight is forty.</div><div><br></div><div>=Five multiplied by eight is forty. 5乘以8等于40。</div><div><br></div><div>注：在Five multiplied by eight is forty中，multiplied by eight為修飾five的過去分詞短語(用作定語;句子主語是five)，其中的multiplied不能換成multiplying或to multiply等。比較：</div><div><br></div><div>If you multiply 7 by 15, you get 105. 如果用15乘以5，結(jié)果是105。</div><div><br></div><div>四、除</div><div><br></div><div>“除”叫divide，是“分開”的意思，來自拉丁語的divido; di即“apart”;vid-， “separate”。請看用例：</div><div><br></div><div>If you divide 20 by 4, the answer is 5. 如果你把20除以4，那么商就是5。</div><div><br></div><div>Ten divided by five is two. 10除以5得2。</div><div><br></div><div>Three will not divide into eleven. 三除不盡十一。</div><div><br></div><div> </div> <h3>咨詢電話 / 微信 同步 美孚英語 15376998000</h3>